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    Suppression of the vestibular short-latency evoked potential by electrical stimulation of the central vestibular system

    Access Status
    Fulltext not available
    Authors
    Pastras, C.
    Curthoys, I.
    Sokolic, L.
    Brown, Daniel
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Pastras, C. and Curthoys, I. and Sokolic, L. and Brown, D. 2018. Suppression of the vestibular short-latency evoked potential by electrical stimulation of the central vestibular system. Hearing Research. 361: pp. 23-35.
    Source Title
    Hearing Research
    DOI
    10.1016/j.heares.2018.01.013
    ISSN
    0378-5955
    School
    School of Pharmacy and Biomedical Sciences
    URI
    http://hdl.handle.net/20.500.11937/74827
    Collection
    • Curtin Research Publications
    Abstract

    In an attempt to view the effects of the efferent vestibular system (EVS) on peripheral dynamic vestibular function, we have monitored the Vestibular short-latency Evoked Potential (VsEP) evoked by pulses of bone conducted vibration during electrical stimulation of the EVS neurons near the floor of the fourth ventricle in the brainstem of anesthetized guinea pigs. Given the reported effects of EVS on primary afferent activity, we hypothesized that EVS stimulation would cause a slight reduction in the VsEP amplitude. Our results show a substantial (>50%) suppression of the VsEP, occurring immediately after a single EVS current pulse. The effect could not be blocked by cholinergic drugs which have been shown to block efferent-mediated vestibular effects. Shocks produced a short-latency P1-N1 response immediately after the electrical artifact which correlated closely to the VsEP suppression. Ultimately, we have identified that this suppression results from antidromic blockade of the afferent response (the VsEP). It would appear that this effect is unavoidable for EVS stimulation, as we found no other effects.

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